2 cycle engine issue

[morfiend]

Didnt shave anything, put stock pistons back in.  Had the crank re-tooled while it was out, one rod had remnants of piston in the bearings and was moving side to side a bit.


Also I have seen oil collecting in the hull.

  The oil leak could be in the pump/tank system,minor!      I editted most of your post to point out something,Had crank retooled?   Undoubtly this is the main cause,could be the throw is out and the piston travels more than it should,could be bering slop causing the same,could be many things combined to cause the piston to hit the plug.

   I hate to tell you this but before you do unrepairable damage I'd tear it down and check it throughly.  If you throw a rod,center cylinder,you can destroy that tripple beyond repair!


    YMMV.

  

[PAKFRONT]

Remember, this is a two stroke, one piece roller bearing rods on pressed pins.. Rah Jo???
A rod kit, is the rod, the roller bearing, 2 thrust bushings, and the crankpin! Ya don't regrind
em undersize like a car engine, they are pressed and trued.. If it was out of true, it never would
have made thru reassembly.. Would be bound up in the case.. I've twisted a few, lol!

[icepac]

Sounds like you are lean on one cylinder.

[VonMessa]

Sounds like you are lean on one cylinder.

My first guess.

Always look at the simple fix, first 

[helbent]

Sounds like you are lean on one cylinder.

Not sure how being lean would close a plug gap.

[CAP1]

Not sure how being lean would close a plug gap.

 cause he's the leet 2 cycle mechanic, and has had one up to 234.543 mph in the floating mile. 

[VonMessa]

Not sure how being lean would close a plug gap.

The leaner the cylinder, the hotter it runs, and a possible cause of thermal issues...

[icepac]

The heat causes the electrode to soften up and then it bends closed.

[CAP1]

they will not bend closed without physical interference.

[ROC]

Over heating will have other tell tale signs.  A plug chart like http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp can help identify conditions such as over heating.  This might help eliminate heat as the problem, maybe look to carbon build up or something else that is impacting enough to bend but not destroy the plug.

I have forgotten the washer on an old 2 stroke once, and it was just enough to smash the electrode, that did some scarring, and the second time my electrode bent was nothing more than I let some debris get in there while doing a field tune up, it was bent but not damaged so I reset the gap and rode back to the truck to replace the plug.  

Side note, having been a rabid 2 stroke jet ski fanatic quite some years ago, how many times have you fouled or flooded the cylinder in the middle of the lake, pulled the plugs while floating, turned the ski over to drain the water and put it back together again    Ahh the good old days of diving under water off a massive wake lol

Lot of good advice in this thread, got some solid 2 strokers backing you up.  

[icepac]

they will not bend closed without physical interference.

Yes they will.

I have one from a 280zx turbo that ran lean and bent closed.

[VonMessa]

Yes they will.

I have one from a 280zx turbo that ran lean and bent closed.

I had a '75 Kawasaki H1 Triple that did that.  Center cylinder.  Put the mercury stick on the carbs, evened them out, problem solved.

[CAP1]

so are these plugs then using bimetallic electrodes?

[Maverick]

Try using a slightly shorter and cooler range plug. That is the cheapest alternative.

[icepac]

so are these plugs then using bimetallic electrodes?

You choose the wrong side of any technical argument because your experience is outside the area in which you intend to argue.

You believe your limited persective to all that there is but you are wrong.

Argue within your depth and you will rarely be wrong.


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